U.S. patent number 6,633,519 [Application Number 09/899,111] was granted by the patent office on 2003-10-14 for optical pick-up device of disk player.
This patent grant is currently assigned to LG Electronics Inc.. Invention is credited to In Woo Lee, Hee Jin Park.
United States Patent |
6,633,519 |
Park , et al. |
October 14, 2003 |
Optical pick-up device of disk player
Abstract
An optical pick-up device includes: a yoke plate having yokes
formed at a front side where a magnetic body and a magnetic driving
coil are positioned to drive an objective lens; a frame molded to
the yoke plate in such a manner that a portion of the rear side of
the yoke plate is inserted thereinto; and a PCB with at least two
portions fixed to the frame, for applying a drive signal to the
magnetic driving unit. Since the frame is press-fit to the yoke
plate and the PCB with several portions coated with the adhesive is
fixedly attached to the frame, it is not necessary to use an
engaging member such as a screw, so that its assembly can be
improved and the frame and the PCB can be prevented from being
shaken.
Inventors: |
Park; Hee Jin (Daegu,
KR), Lee; In Woo (Pyeongtaeg, KR) |
Assignee: |
LG Electronics Inc. (Seoul,
KR)
|
Family
ID: |
26638199 |
Appl.
No.: |
09/899,111 |
Filed: |
July 6, 2001 |
Foreign Application Priority Data
|
|
|
|
|
Jul 8, 2000 [KR] |
|
|
2000/39133 |
Oct 25, 2000 [KR] |
|
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2000/63050 |
|
Current U.S.
Class: |
369/44.14;
359/813; 369/112.23; 369/44.15; G9B/7.084 |
Current CPC
Class: |
G11B
7/0933 (20130101) |
Current International
Class: |
G11B
7/09 (20060101); G11B 007/00 () |
Field of
Search: |
;369/44.11,44.12,44.14,44.15,44.16,44.21,112.23
;359/813,814,823,824 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Edun; Muhammad
Attorney, Agent or Firm: Birch, Stewart, Kolasch &
Birch, LLP
Claims
What is claimed is:
1. An optical pick-up device comprising: a yoke plate having yokes
formed at a front side where a magnetic body and a magnetic driving
coil are positioned to drive an objective lens; a frame fixed to
the yoke plate in such a manner that a portion of the rear side of
the yoke plate is inserted thereinto; and a PCB with at least two
portions fixed to the frame, for applying a drive signal to the
magnetic driving coil.
2. The device of claim 1, wherein the yoke plate has an insertion
portion bent in the orthogonal direction to a bottom portion so
that the frame can be molded.
3. The device of claim 1, wherein the yoke plate further comprises:
an outer yoke bent in the orthogonal direction to a bottom portion
at the front side; and an inner yoke cut at the middle portion of
the yoke plate and bent in the same direction of said outer
yoke.
4. The device of claim 1, wherein the frame includes an insertion
hole for receiving said portion of said rear side of said yoke
plate.
5. An optical pick-up device comprising: a yoke plate having yokes
formed at a front side where a magnetic body and a magnetic driving
coil are positioned to drive an objective lens; and a frame molded
to the yoke plate in a state that a portion of the rear side of the
yoke plate is inserted thereinto.
6. The device of claim 5, wherein the yoke plate has an insertion
portion bent in the orthogonal direction to a bottom portion so
that the frame can be molded.
7. The device of claim 6, wherein the yoke plate comprises: an
outer yoke bent in the orthogonal direction to a bottom portion at
the front side; and an inner yoke cut at the middle portion of the
yoke plate and bent in the same direction of the outer yoke,
wherein the outer yoke and the inner yoke are formed having the
same size.
8. The device of claim 7, wherein the upper portion of the inner
yoke is cut at an inner portion of the insertion portion but beyond
a line where the insertion portion is bent from the bottom
portion.
9. The device of claim 8, wherein the insertion portion is formed
in a `U` shape.
10. The device of claim 5, wherein the objective lens and the
magnetic driving coil are installed at a holder and the holder is
supported by a plurality of suspension wires connected to the PCB
being fixed to the frame, and the frame includes holes through
which the suspension wires pass.
11. The device of claim 10, wherein the holes are formed in such a
manner that its upper portion is opened so as for the suspension
wires to be easily inserted thereinto.
12. The device of claim 5, wherein the frame includes an insertion
hole for receiving said portion of said rear side of said yoke
plate.
13. An optical pick-up device comprising: a yoke plate having yokes
formed at a front side where a magnetic body and a magnetic driving
coil are positioned to drive an objective lens; a frame fixed to a
rear side of the yoke plate, wherein an insertion portion is formed
at the rear side of the yoke plate and an insertion hole is formed
at the frame so that the insertion portion is press-fit to the
insertion hole, thereby fixing the frame to the yoke plate; and a
PCB with at least two portions fixed to the frame, for applying a
drive signal to the magnetic driving coil.
14. An optical pick-up device comprising: a yoke plate having yokes
formed at a front side where a magnetic body and a magnetic driving
coil are positioned to drive an objective lens; a frame fixed to a
rear side of the yoke plate; and a PCB with at least two portions
fixed to the frame, for applying a drive signal to the magnetic
driving coil.
15. The device of claim 14, wherein thread holes are formed at the
PCB and the frame, and the PCB and the frame are mutually fixed as
a screw is threaded into the thread holes, and at the same time, at
least one portion thereof is attached by an adhesive.
16. The device of claim 15, wherein the at least two portions of
both sides of the screw engaging portion are attached by the
adhesive so as for the PCB and the frame to be fixed.
17. The device of claim 15, wherein the mutually fixed portions of
the PCB and the frame are formed in a rectangular shape, and four
rectangular corner portions are attached by the adhesive.
18. The device of claim 14, wherein the PCB and the frame are fixed
together as at least three portions are attached by the
adhesive.
19. The device of claim 14, wherein the frame includes an insertion
hole for receiving a portion of said rear side of said yoke plate.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a slim type optical pick-up device
for recording and/or reproducing information into and from an
optical disk.
2. Description of the Background Art
In general, an optical pick-up device records and/or reproduces
information by transmitting and receiving a light to and from the
optical disk. According to an notebook computer or an portable disk
player is more and more slim, the optical pick-up device for an
notebook computer or an portable disk player is needed more
compact
FIG. 1 is a schematic view showing the construction of an optical
pick-up device in accordance with a conventional art.
As shown in FIG. 1, in the conventional optical pick-up device, a
frame 20 is installed at a rear side of a yoke plate 10, and a
printed circuit board (PCB) 30 is mounted at a rear side of the
frame 20 and connected to an pick-up driving circuit through a
flexible print circuit (FPC) 33.
An outer yoke 12 and an inner yoke 13 stand at a front side of the
yoke plate 10, and permanent magnets 17 and 18 are fixed in a
facing manner between the two yokes 12 and 13.
A holder 40 is positioned at a front side of the yoke plate 10,
which is supported by four suspension wires 35 connected to the PCB
30.
The holder 40 includes an objective lens 41 for focussing light
radiated from a light source on a recording layer of the optical
disk, and a magnetic driving coils 45 for varying a position of the
holder 40 horizontally and vertically according to the mutual
interaction with the permanent magnets 17 and 18.
The frame 20 is provided with holes 21, through which the
suspension wires 35 pass. The suspension wires 35 are made of a
conductive material so that a signal outputted from the PCB 30 can
be applied to the magnetic driving coils 45.
In the optical pick-up device, in a state that the holder 40 is
supported by the suspension wires 35, as it moves vertically and
horizontally according to a mutual interaction between the magnetic
driving coils 45 and the permanent magnets 17 and 18, the position
of the objective lens 41 can be varied, and accordingly, focussing
and tracking operations are performed.
With reference to FIGS. 2 through 4, a coupling structure between
the yoke plate 10, the frame 20 and the PCB 30 will now be
described.
FIGS. 2 and 3 are a side view and a plan view showing the coupling
structure of the yoke plate, the frame and the PCB, and FIG. 4 is a
development view of the yoke plate.
With reference to FIG. 4, as for the yoke plate 10, an outer yoke
12 and an inner yoke 13 are formed bent upwardly at the front side
of a bottom portion 11, side portions 14 are formed bent upwardly
at both sides of the yoke plate 10, and a fixing portion 15 is
formed bent upwardly at the rear side.
A fixing portion 15 includes a hole 15a at the central portion to
engage a screw 31 therethrough.
With reference to FIGS. 2 and 3, in the yoke plate 10, the
permanent magnets 17 and 18 are fixed in a manner of attaching to
the outer yoke 12 and the inner yoke 13, and the frame 20 and the
PCB 30 are threaded by the screw 31 at the rear side of the fixing
portion 15.
However, the conventional optical pick-up device as described above
has the following problem. That is, as shown in FIGS. 2 and 4,
since the height and the width of the inner yoke 13 are formed
shorter and smaller than those of the outer yoke 12, the inner yoke
13 has a relatively restricted coercive force of the permanent
magnet 18, at which an operation characteristic of the optical
pick-up device is degraded.
The reason why the inner yoke 13 is formed smaller than the outer
yoke 12 is that, with reference to FIG. 4, the hole 15a is formed
in the fixing portion 15 of the yoke plate 10, through which the
PCB 30 and the frame 20 are threaded by the screw 31, and in this
respect, in order to obtain a sufficient supporting force against
the PCB 30 and the frame 20 as well as to provide the hole 15a at
the fixing portion 15, there is a limitation to reduce the area of
the fixing portion 15. Otherwise, if the optical pick-up device is
desired to be designed compact under the condition that the fixing
portion 15 is enlarged, the size of the inner yoke 13 is relatively
reduced.
Consequently, in order for the fixing portion 15 to form the hole
15a for threading as well as obtain a sufficient supporting area,
the inner yoke 13 is inevitably limited in its size.
If the fixing portion 15 is designed to have a sufficient
supporting area while increasing the size of the inner yoke 13, the
overall yoke plate 10 is enlarged, causing a problem that the
optical pick-up device wouldn't be designed compact.
The above-described conventional optical pick-up device has another
problem. The PCB 30 and the frame 20 are fixed by being threaded by
one screw 31 at the fixing portion 15 of the yoke plate 10, so that
if the engaging force of the screw 31 is weakened or due to the
typically flexible characteristic of the PCB 30, as shown in FIG.
5, when the holder 40 is moved vertically or horizontally, the PCB
30 and the frame 20 are simultaneously moved, causing an abnormal
movement of an objective lens 41, resulting in failure of a normal
focussing and tracking operation.
In other words, when the holder 40 is moved according to a mutual
interaction between the magnetic driving coil 45 and the permanent
magnets 17 and 18, if the PCB 30 connected to the suspension wires
35 are inclined vertically or horizontally, the central axis of the
objective lens 41 would deviate from the center position as shown
in FIG. 5. And at this time, a normal focussing and tracking
operation do not made, so that the performance of the optical
pick-up device is degraded.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide an
optical pick-up device which is capable of being designed more
compactness while heightening a coercive force of a permanent
magnet and capable of improving an operation characteristic and
performance for an optical pick-up by fixing a PCB and a frame at a
yoke plate without being shaken.
To achieve these and other advantages and in accordance with the
purpose of the present invention, as embodied and broadly described
herein, there is provided an optical pick-up device including: a
yoke plate having yokes formed at a front side where a magnetic
body and a magnetic driving unit are positioned to drive an
objective lens; a frame fixed to the yoke plate in such a manner
that a portion of the rear side of the yoke plate is inserted
thereinto; and a PCB with at least two portions fixed to the frame,
for applying a drive signal to the magnetic driving unit.
In the optical pick-up device of the present invention, the yoke
plate includes: an outer yoke bent in the orthogonal direction to a
bottom portion at the front side; an inner yoke cut at the middle
portion of the yoke plate and bent in the same direction of the
outer yoke; and an insertion portion bent in the orthogonal
direction to the bottom portion so as for the frame to be fixed
thereto.
In the optical pick-up device of the present invention, the outer
yoke and the inner yoke are formed having the same size, and the
insertion portion is formed in a `U` shape.
In the optical pick-up device of the present invention, as for the
inner yoke, its upper portion is cut at the inner portion of the
insertion portion beyond the line where the insertion portion is
bent from the bottom portion.
In the optical pick-up device of the present invention, the
objective lens and the magnetic driving unit are installed at a
holder, and the holder is supported by a plurality of suspension
wires connected to the PCB.
In the optical pick-up device of the present invention, the frame
includes holes through which the suspension wires pass, and the
holes are formed with its upper portion opened so that the
suspension wires can be easily inserted thereto.
In the optical pick-up device of the present invention, a thread
hole is formed at both the PCB and the frame, and a screw is
engaged at the thread holes of the PCB and the frame, and at the
same time, at least one portions of the PCB and the frame are
attached by an adhesive to be mutually fixed.
In the optical pick-up device of the present invention, the
mutually fixed portions between the PCB and the frame are formed
rectangular, and the rectangular four corner portions are attached
by an adhesive.
In order to obtain the above objects, there is further provided an
optical pick-up device including: a yoke plate having yokes formed
at a front side where a magnetic body and a magnetic driving unit
are positioned to drive an objective lens; and a frame fixed to the
rear side of the yoke plate, wherein an insertion portion is formed
at a rear side of the yoke plate and an insertion hole is formed at
the frame so that the insertion portion is press-fit to the
insertion hole, thereby fixing the frame to the yoke plate.
In the optical pick-up device of the present invention, the PCB is
fixed to the frame by being attached at least three portions by
using an adhesive without a screw.
The foregoing and other objects, features, aspects and advantages
of the present invention will become more apparent from the
following detailed description of the present invention when taken
in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and
constitute a part of this specification, illustrate embodiments of
the invention and together with the description serve to explain
the principles of the invention.
In the drawings:
FIG. 1 is a perspective view showing an optical pick-up device in
accordance with a conventional art;
FIG. 2 is a side view showing the coupling structure between a yoke
plate, a frame and a PCB of the optical pick-up device in
accordance with the conventional art;
FIG. 3 is a plan view showing the coupling structure between the
yoke plate, the frame and the PCB of the optical pick-up device in
accordance with the conventional art;
FIG. 4 is a development view of the yoke plate of the optical
pick-up device in accordance with the conventional art;
FIG. 5 is a reference view showing the operation state of the
optical pick-up device in accordance with the conventional art;
FIG. 6 is a perspective view showing an optical pick-up device in
accordance one embodiment of the present invention;
FIG. 7 is an exploded perspective view showing the coupling
structure between a yoke plate, a frame and a PCB of the optical
pick-up device in accordance with one embodiment of the present
invention;
FIG. 8 is a side view showing the coupling structure between the
yoke plate, the frame and the PCB of the optical pick-up device in
accordance with one embodiment of the present invention;
FIG. 9 is a plan view showing the coupling structure between the
yoke plate, the frame and the PCB of the optical pick-up device in
accordance with one embodiment of the present invention;
FIG. 10 is a development view of the yoke plate included in the
optical pick-up device in accordance with one embodiment of the
present invention;
FIG. 11 is a front view of the PCB included in the optical pick-up
device in accordance with one embodiment of the present
invention;
FIG. 12 is a side view showing an operation state of the optical
pick-up device in accordance with one embodiment of the present
invention; and
FIG. 13 is an exploded perspective view showing the coupling
structure between a yoke plate, the frame and a PCB of an optical
pick-up device in accordance with another embodiment of the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Reference will now be made in detail to the preferred embodiments
of the present invention, examples of which are illustrated in the
accompanying drawings.
The optical pick-up device in accordance with one embodiment of the
present invention will now be described with reference to FIGS. 6
through 12.
FIG. 6 is a perspective view showing an optical pick-up device in
accordance one embodiment of the present invention.
In the optical pick-up device of the present invention, a frame 60
is fixed by an insert-molding method at the rear side of a yoke
plate 50, and a PCB 70 connected to the optical pick-up driving
circuit through a flexible print circuit (FPC) 73 is threaded at
the rear side of the frame 60 and at the same time adhered to be
fixed by using an adhesive 77.
An outer yoke 52 and inner yoke 53 stand at the front side of the
yoke plate 50, and permanent magnets 57 and 58 are fixed to be
positioned in a facing manner at the two yokes 52 and 53.
A holder 80 is positioned at the front side of the yoke plate 50,
and supported by four suspension wires 85 connected to the PCB
70.
The holder 80 includes an objective lens 81 for focussing a light
radiated from a light source on a recording layer of an optical
disk and magnetic driving coils 88 for varying the position of the
holder 80 vertically and horizontally owing to the mutual
interaction with the permanent magnets 57 and 58.
FIG. 7 is an exploded perspective view showing the coupling
structure between a yoke plate, a frame and a PCB of the optical
pick-up device in accordance with one embodiment of the present
invention, FIG. 8 is a side view showing the coupling structure
between the yoke plate, the frame and the PCB of the optical
pick-up device in accordance with one embodiment of the present
invention, FIG. 9 is a plan view showing the coupling structure
between the yoke plate, the frame and the PCB of the optical
pick-up device in accordance with one embodiment of the present
invention, and FIG. 10 is a development view of the yoke plate
included in the optical pick-up device in accordance with one
embodiment of the present invention.
First, referring to the yoke plate 50, the outer yoke 52 formed
bent in the orthogonal direction to a bottom portion 51 at the
front side of the bottom portion 51. The inner yoke 52 is cut at
the central portion of the bottom portion 51 and bent in the same
direction to the outer yoke 52. Side portions 54 are formed bent
upwardly at both sides of the bottom portion 51 to thereby support
the both side portions of the frame 60.
An insertion portion 55 is formed bent in the orthogonal direction
to the bottom portion 51 at the rear side of the bottom portion 51
so that the frame 60 is fixed thereto by the insert-molding
method.
The outer yoke 52, the inner yoke 53 and the insertion portion 55
are bent at bending lines B1, B2 and B3 as shown in FIG. 10 and
stand vertically to the bottom portion 51.
Especially, as for the inner yoke 53, its upper portion is cut and
bent at the inner side of the insertion portion 55 beyond the line
B3 where the insertion portion 55 is bent from the bottom portion
51.
Accordingly, the insertion portion 55 is formed in a `U` shape and
a space `S` is provided for enlarging the size of the inner yoke
53, so that the inner yoke 53 can be formed with the same size as
that of the outer yoke 52 even without increasing the overall size
of the yoke plate 50.
As shown in FIG. 7, a stopper plate 56 is connected at the upper
portion of the outer yoke 52 and the inner yoke 53 to restrict the
movement of the holder 80 to a predetermined range.
With reference to FIGS. 8 through 10, reference numeral 51a of the
yoke plate 50 is a protrusion formed to support the permanent
magnets 57 and 58, and two 51b are holes through which the yoke
plate 50 is threaded with a base (not shown) by using a screw.
Reference numerals 52a and 53a are coupling protrusions to which
the stopper plate 56 is coupled.
As shown in FIG. 7, the frame 60 is fixed to the yoke plate 50 by
being molded in a state that the insertion portion 55 of the yoke
pate 50 is inserted therein.
The frame 60 may be made of a hard synthetic resin material so as
to be fixed by the insert-molding method and formed in a hexahedral
shape with the insertion portion 55 inserted at the central portion
thereof.
The frame 60 includes two holes 61 through which the suspension
wires 85 are to pass. The holes 61 include an opening portion 61a
at the upper portion to allow the suspension wires 85 to be easily
inserted.
The suspension wires 85 are fabricated of a conductive material to
enable a signal outputted from the PCB 70 to be applied to the
magnetic driving coils 88.
Reference numeral 66 of FIGS. 7 through 9 denotes protrusions to
which the PCB 70 is coupled, 67 denotes protrusions for supporting
the FPC 73 so as not to be released, and 60b is a thread hole to
which the PCB 70 is assembled by a screw 71.
The PCB 70 is threaded by the screw 71 with the frame 60 as well as
being adhered thereto by using an adhesive 77.
FIG. 11 is a front view of the PCB included in the optical pick-up
device in accordance with one embodiment of the present
invention.
As shown in FIG. 11, the PCB 70 includes a thread hole 70a formed
at a central lower portion thereof, to which the frame 60 is
assembled by the screw 71, and bonding portions 75 are formed at
four rectangular corner portions, both upper and lower portions of
the thread hole 70a, to which the adhesive 77 is attached.
At the PCB 70, four circuit patterns 73 are formed to print a
circuit connected to the four suspension wires 85, and holes 70c
are formed at the upper portion of the thread hole 70a, into which
the protrusion 66 of the frame 60 of FIG. 9. Through holes 70b are
formed at both sides of the holes.
With reference to FIG. 7, the PCB 70 is threaded with the frame 60
and at the same time, the four portions of both sides of the screw
71 are adhered to the frame 60 by using the adhesive 77, so that
the PCB 70 would not be shaken from the frame 60.
The operation and effect of the optical pick-up device in
accordance with one embodiment of the present invention constructed
as described above will now be explained.
When the frame 60 is fixed to the insertion portion 55 of the yoke
plate 50 by the insert-molding method, the insertion portion 55 is
inserted into the central portion of the frame 60 and the both
faces of the frame are supported by the side portions 54.
At this time the frame 60 is integrally combined to the yoke plate
50.
As the frame 60 is integrally coupled by being insert-molded in the
insertion portion 55, the insertion portion 55 does not need to be
assembled in the method of screw engagement like in the
conventional art. Accordingly it is not necessary to form a thread
hole for assembling a screw to the insertion portion 55, and thus,
as shown in FIG. 10, the inner yoke 53 can be enlarged by being
extended up to the inner central portion of the insertion portion
55.
Accordingly, since the inner yoke 53 can be formed relatively high,
the inner yoke 53 and the outer yoke 52 can be formed having the
same height and area.
In the optical pick-up device, the frame 60 is firmly fixed at the
yoke plate 50 so that it won't be shaken even without an engaging
unit such as a screw.
In addition, since the coercive force of the inner yoke 53 and the
outer yoke 52 can be maintained the same, such a problem that the
coercive force of the permanent magnet is restricted to degrade the
operation characteristic of the optical pick-up device as in the
conventional art, can be solved.
With reference back to FIG. 6, in the optical pick-up device, when
a drive signal is inputted through the PCB 70 to the magnetic
driving coils 88, the magnetic driving coils 88 and the permanent
magnets 57 and 58 interact to each other, according to which the
holder 80 is moved vertically and horizontally, varying the
position of the objective lens 81.
As the position of the objective lens 81 is varied, a focusing or a
tracking operation can be performed to vary the focal point of the
beam spot formed on the record face of the optical disk.
Since the PCB 70 is fixed to the frame 60 by the screw 71 and the
adhesive 77, when then holder 80 is moved vertically and
horizontally, it wouldn't be shaken vertically and
horizontally.
Accordingly, in the present invention, since the PCB 70 and the
frame 60 are fixed to the yoke plate 50 without being shaken, as
shown in FIG. 12, a phenomenon that the holder 80 supported by the
suspension wires 85 is abnormally moved is prevented, and
accordingly, the central axis of the objective lens 81 is
constantly moved from the center, so that a normal focussing and
tracking operation can be performed.
An optical pick-up device in accordance with another embodiment of
the present invention will now be described with reference to FIG.
13.
FIG. 13 is an exploded perspective view showing the coupling
structure between a yoke plate, the frame and a PCB of an optical
pick-up device in accordance with another embodiment of the present
invention.
Unlike the former embodiment of the present invention in which the
frame is fixed to the yoke plate by the insert molding method and
the PCB is fixed to the frame by the screw and the adhesive, a
feature of another embodiment of the present invention is that a
frame 160 is press-fit to a yoke plate 150 and a PCB 170 is fixedly
attached to the frame 160 by only an adhesive 177 without using a
screw.
That is, an insertion portion 155 is formed at the rear side of the
yoke plate 150 and an insertion hole 165 is formed at the frame
160.
Accordingly, the insertion portion 155 of the yoke plate 150 is
forcibly press-fit to the insertion hole 165 of the frame 60, so
that the frame 160 is fixed to the yoke plate 150.
In this respect, preferably, the insertion portion 155 and the
insertion hole 165 have such a size that they are mutually
press-fit to be coupled and are not easily released from each
other, and an adhesive may be used as necessary to attach them more
firmly.
The PCB 170 and the frame 160 are attached by the adhesive at least
three portions and fixed together.
Namely, as shown in FIG. 13, the adhesive 177 is coated at the both
upper portions and the lower central portion of the PCB 170 and
then the PCB is fixedly attached to the frame 160.
Of course, four corner portions and the central portion of the PCB
170 may be coated with the adhesive 177 and the PCB is attached to
the frame 160.
The optical pick-up device in accordance with another embodiment of
the present invention has the following advantages.
For example, since the frame 160 is press-fit to the yoke plate 150
and the PCB 170 with several portions coated with the adhesive 177
is fixedly attached to the frame 160, it is not necessary to use an
engaging member such as a screw, so that its assembly can be
improved and the frame 160 and the PCB 170 can be prevented from
being shaken.
As the present invention may be embodied in several forms without
departing from the spirit or essential characteristics thereof, it
should also be understood that the above-described embodiments are
not limited by any of the details of the foregoing description,
unless otherwise specified, but rather should be construed broadly
within its spirit and scope as defined in the appended claims, and
therefore all changes and modifications that fall within the meets
and bounds of the claims, or equivalence of such meets and bounds
are therefore intended to be embraced by the appended claims.
* * * * *